Masked owl (Tyto novaehollandiae), one of many birds of prey at great risk of secondary poisoning Belinda Davis

Mouse plague: bromadiolone will obliterate mice, but it’ll poison eagles, snakes and owls, too

The NSW government has secured an extremely toxic bait to try to end the mouse plague. But there are safer alternatives.
Yolks are a great source of vitamins, minerals, fats and proteins packaged up by the female animal for an embryo. Emily Nunell/The Conversation CC-NY-BD

Curious Kids: why do eggs have a yolk?

A yolk allows a developing animal to stay in an egg longer, boosting its chance of survival. The downside is the mother has to work hard finding extra food so her body can create a nutritious yolk.

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